Heraldry question

So I main the Bulwark class in SM2 and I wanted to make the colors as lore accurate as possible I’ve done a little bit of research and I don’t see the Raven Guard using these guys with shields really at all (they may have some unit I’m not aware of but I don’t think so) but I like the idea of the sneaky Raven Guard having these guys Popping out the shadows with swords and shields up to decimate any foe just to disappear in a moments notice, so I wanna ask my fellow followers of Corvus to see if I would need to change any colors, trimmings, or emblems any help is greatly appreciated Brothers Victorus Aut Mortis